12228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 22228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* ----------------------------------------------------------------------------------------------------------- 32228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectSoftware License for The Fraunhofer FDK AAC Codec Library for Android 42228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 54f0d97057c5c640b25518358886f8c47da9fc052Jean-Michel Trivi� Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V. 62228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project All rights reserved. 72228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 82228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1. INTRODUCTION 92228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectThe Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectthe MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 112228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectThis FDK AAC Codec software is intended to be used on a wide variety of Android devices. 122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 132228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectAAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectaudio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectindependent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectof the MPEG specifications. 172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 182228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectPatent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectmay be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectindividually for the purpose of encoding or decoding bit streams in products that are compliant with 212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectthe ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectthese patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectsoftware may already be covered under those patent licenses when it is used for those licensed purposes only. 242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 252228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectCommercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectare also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectapplications information and documentation. 282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project2. COPYRIGHT LICENSE 302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 312228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectRedistribution and use in source and binary forms, with or without modification, are permitted without 322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectpayment of copyright license fees provided that you satisfy the following conditions: 332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 342228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou must retain the complete text of this software license in redistributions of the FDK AAC Codec or 352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectyour modifications thereto in source code form. 362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 372228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou must retain the complete text of this software license in the documentation and/or other materials 382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectprovided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 392228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou must make available free of charge copies of the complete source code of the FDK AAC Codec and your 402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectmodifications thereto to recipients of copies in binary form. 412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 422228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectThe name of Fraunhofer may not be used to endorse or promote products derived from this library without 432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectprior written permission. 442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 452228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectsoftware or your modifications thereto. 472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 482228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYour modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectand the date of any change. For modified versions of the FDK AAC Codec, the term 502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term 512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project3. NO PATENT LICENSE 542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 552228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectNO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 562228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectrespect to this software. 582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 592228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectYou may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectby appropriate patent licenses. 612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project4. DISCLAIMER 632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 642228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectThis FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors 652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties 662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectof merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 672228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectCONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectincluding but not limited to procurement of substitute goods or services; loss of use, data, or profits, 692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projector business interruption, however caused and on any theory of liability, whether in contract, strict 702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectliability, or tort (including negligence), arising in any way out of the use of this software, even if 712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectadvised of the possibility of such damage. 722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project5. CONTACT INFORMATION 742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 752228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectFraunhofer Institute for Integrated Circuits IIS 762228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectAttention: Audio and Multimedia Departments - FDK AAC LL 772228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectAm Wolfsmantel 33 782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project91058 Erlangen, Germany 792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectwww.iis.fraunhofer.de/amm 812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectamm-info@iis.fraunhofer.de 822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project----------------------------------------------------------------------------------------------------------- */ 832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/*! 852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \file 862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \brief FDK resampler tool box: 872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \author M. Werner 882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "resampler.h" 912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#include "genericStds.h" 932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/**************************************************************************/ 962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* BIQUAD Filter Specifications */ 972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/**************************************************************************/ 982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define B1 0 1002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define B2 1 1012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define A1 2 1022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define A2 3 1032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define BQC(x) FL2FXCONST_SGL(x/2) 1052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstruct FILTER_PARAM { 1082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_SGL *coeffa; /*! SOS matrix One row/section. Scaled using BQC(). Order of coefficients: B1,B2,A1,A2. B0=A0=1.0 */ 1092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL g; /*! overall gain */ 1102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int Wc; /*! normalized passband bandwidth at input samplerate * 1000 */ 1112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int noCoeffs; /*! number of filter coeffs */ 1122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int delay; /*! delay in samples at input samplerate */ 1132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 1142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define BIQUAD_COEFSTEP 4 1162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/** 1182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *\brief Low Pass 1192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Wc = 0,5, order 30, Stop Band -96dB. Wc criteria is "almost 0dB passband", not the usual -3db gain point. 1202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [b,a]=cheby2(30,96,0.505) 1212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [sos,g]=tf2sos(b,a) 1222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project bandwidth 0.48 1232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project */ 1242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_SGL sos48[] = { 1252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.98941075681938), BQC(0.999999996890811), BQC(0.863264527201963), BQC( 0.189553799960663), 1262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.90733804822445), BQC(1.00000001736189), BQC(0.836321575841691), BQC( 0.203505809266564), 1272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.75616665495325), BQC(0.999999946079721), BQC(0.784699225121588), BQC( 0.230471265506986), 1282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.55727745512726), BQC(1.00000011737815), BQC(0.712515423588351), BQC( 0.268752723900498), 1292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.33407591943643), BQC(0.999999795953228), BQC(0.625059117330989), BQC( 0.316194685288965), 1302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.10689898412458), BQC(1.00000035057114), BQC(0.52803514366398), BQC( 0.370517843224669), 1312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.89060371078454), BQC(0.999999343962822), BQC(0.426920462165257), BQC( 0.429608200207746), 1322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.694438261209433), BQC( 1.0000008629792), BQC(0.326530699561716), BQC( 0.491714450654174), 1332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.523237800935322), BQC(1.00000101349782), BQC(0.230829556274851), BQC( 0.555559034843281), 1342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.378631165929563), BQC(0.99998986482665), BQC(0.142906422036095), BQC( 0.620338874442411), 1352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.260786911308437), BQC(1.00003261460178), BQC(0.0651008576256505), BQC( 0.685759923926262), 1362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.168409429188098), BQC(0.999933049695828), BQC(-0.000790067789975562), BQC( 0.751905896602325), 1372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.100724533818628), BQC(1.00009472669872), BQC(-0.0533772830257041), BQC( 0.81930744384525), 1382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.0561434357867363), BQC(0.999911636304276), BQC(-0.0913550299236405), BQC( 0.88883625875915), 1392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.0341680678662057), BQC(1.00003667508676), BQC(-0.113405185536697), BQC( 0.961756638268446) 1402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 1412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#ifdef RS_BIQUAD_SCATTERGAIN 1432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g48 = FL2FXCONST_DBL(0.67436532061161992682404480717671 - 0.001); 1442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 1452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g48 = FL2FXCONST_DBL(0.002712866530047) - (FIXP_DBL)0x8000; 1462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 1472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const struct FILTER_PARAM param_set48 = { 1492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project sos48, 1502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project g48, 1512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 480, 1522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 15, 1532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4 /* LF 2 */ 1542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 1552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/** 1572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *\brief Low Pass 1582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Wc = 0,5, order 24, Stop Band -96dB. Wc criteria is "almost 0dB passband", not the usual -3db gain point. 1592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [b,a]=cheby2(24,96,0.5) 1602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [sos,g]=tf2sos(b,a) 1612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project bandwidth 0.45 1622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project */ 1632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_SGL sos45[] = { 1642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.982962601444), BQC(1.00000000007504), BQC(0.646113303737836), BQC( 0.10851149979981), 1652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.85334094281111), BQC(0.999999999677192), BQC(0.612073220102006), BQC( 0.130022141698044), 1662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.62541051415425), BQC(1.00000000080398), BQC(0.547879702855959), BQC( 0.171165825133192), 1672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.34554656923247), BQC(0.9999999980169), BQC(0.460373914508491), BQC( 0.228677463376354), 1682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.05656568503116), BQC(1.00000000569363), BQC(0.357891894038287), BQC( 0.298676843912185), 1692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.787967587877312), BQC(0.999999984415017), BQC(0.248826893211877), BQC( 0.377441803512978), 1702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.555480971120497), BQC(1.00000003583307), BQC(0.140614263345315), BQC( 0.461979302213679), 1712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.364986207070964), BQC(0.999999932084303), BQC(0.0392669446074516), BQC( 0.55033451180825), 1722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.216827267631558), BQC(1.00000010534682), BQC(-0.0506232228865103), BQC( 0.641691581560946), 1732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.108951672277119), BQC(0.999999871167516), BQC(-0.125584840183225), BQC( 0.736367748771803), 1742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.0387988607229035), BQC(1.00000011205574), BQC(-0.182814849097974), BQC( 0.835802108714964), 1752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.0042866175809225), BQC(0.999999954830813), BQC(-0.21965740617151), BQC( 0.942623047782363) 1762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 1772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#ifdef RS_BIQUAD_SCATTERGAIN 1792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g45 = FL2FXCONST_DBL(0.60547428891341319051142629706723 - 0.001); 1802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 1812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g45 = FL2FXCONST_DBL(0.00242743980909524) - (FIXP_DBL)0x8000; 1822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 1832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const struct FILTER_PARAM param_set45 = { 1852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project sos45, 1862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project g45, 1872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 450, 1882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 12, 1892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4 /* LF 2 */ 1902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 1912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 1922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* 1932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Created by Octave 2.1.73, Mon Oct 13 17:31:32 2008 CEST 1942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Wc = 0,5, order 16, Stop Band -96dB damping. 1952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [b,a]=cheby2(16,96,0.5) 1962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [sos,g]=tf2sos(b,a) 1972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project bandwidth = 0.41 1982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project */ 1992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_SGL sos41[] = 2012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 2022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.96193625292), BQC(0.999999999999964), BQC(0.169266178786789), BQC(0.0128823300475907), 2032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.68913437662092), BQC(1.00000000000053), BQC(0.124751503206552), BQC(0.0537472273950989), 2042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.27274692366017), BQC(0.999999999995674), BQC(0.0433108625178357), BQC(0.131015753236317), 2052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.85214175088395), BQC(1.00000000001813), BQC(-0.0625658152550408), BQC(0.237763778993806), 2062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.503841579939009), BQC(0.999999999953223), BQC(-0.179176128722865), BQC(0.367475236424474), 2072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.249990711986162), BQC(1.00000000007952), BQC(-0.294425165824676), BQC(0.516594857170212), 2082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.087971668680286), BQC(0.999999999915528), BQC(-0.398956566777928), BQC(0.686417767801123), 2092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.00965373325350294), BQC(1.00000000003744), BQC(-0.48579173764817), BQC(0.884931534239068) 2102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 2112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#ifdef RS_BIQUAD_SCATTERGAIN 2132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g41 = FL2FXCONST_DBL(0.44578514476476679750811222123569); 2142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 2152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g41 = FL2FXCONST_DBL(0.00155956951169248); 2162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 2172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const struct FILTER_PARAM param_set41 = { 2192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project sos41, 2202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project g41, 2212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 410, 2222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 8, 2232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5 /* LF 3 */ 2242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 2252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* 2272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project # Created by Octave 2.1.73, Mon Oct 13 17:55:33 2008 CEST 2282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Wc = 0,5, order 12, Stop Band -96dB damping. 2292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [b,a]=cheby2(12,96,0.5); 2302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [sos,g]=tf2sos(b,a) 2312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 2322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_SGL sos35[] = 2332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 2342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.93299325235762), BQC(0.999999999999985), BQC(-0.140733187246596), BQC(0.0124139497836062), 2352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.4890416764109), BQC(1.00000000000011), BQC(-0.198215402588504), BQC(0.0746730616584138), 2362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.918450161309795), BQC(0.999999999999619), BQC(-0.30133912791941), BQC(0.192276468839529), 2372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.454877024246818), BQC(1.00000000000086), BQC(-0.432337328809815), BQC(0.356852933642815), 2382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.158017147118507), BQC(0.999999999998876), BQC(-0.574817494249777), BQC(0.566380436970833), 2392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.0171834649478749), BQC(1.00000000000055), BQC(-0.718581178041165), BQC(0.83367484487889) 2402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 2412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#ifdef RS_BIQUAD_SCATTERGAIN 2432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g35 = FL2FXCONST_DBL(0.34290853574973898694521267606792); 2442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 2452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g35 = FL2FXCONST_DBL(0.00162580994125131); 2462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 2472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const struct FILTER_PARAM param_set35 = { 2492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project sos35, 2502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project g35, 2512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 350, 2522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 6, 2532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4 2542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 2552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* 2572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project # Created by Octave 2.1.73, Mon Oct 13 18:15:38 2008 CEST 2582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Wc = 0,5, order 8, Stop Band -96dB damping. 2592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [b,a]=cheby2(8,96,0.5); 2602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project [sos,g]=tf2sos(b,a) 2612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 2622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_SGL sos25[] = 2632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 2642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.85334094301225), BQC(1.0), BQC(-0.702127214212663), BQC(0.132452403998767), 2652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(1.056565682167), BQC(0.999999999999997), BQC(-0.789503667880785), BQC(0.236328693569128), 2662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.364986307455489), BQC(0.999999999999996), BQC(-0.955191189843375), BQC(0.442966457936379), 2672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project BQC(0.0387985751642125), BQC(1.0), BQC(-1.19817786088084), BQC(0.770493895456328) 2682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 2692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#ifdef RS_BIQUAD_SCATTERGAIN 2712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g25 = FL2FXCONST_DBL(0.17533917408936346960080259950471); 2722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 2732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const FIXP_DBL g25 = FL2FXCONST_DBL(0.000945182835294559); 2742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 2752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const struct FILTER_PARAM param_set25 = { 2772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project sos25, 2782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project g25, 2792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 250, 2802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4, 2812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5 2822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 2832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* Must be sorted in descending order */ 2852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic const struct FILTER_PARAM *const filter_paramSet[] = { 2862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ¶m_set48, 2872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ¶m_set45, 2882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ¶m_set41, 2892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ¶m_set35, 2902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ¶m_set25 2912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project}; 2922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/**************************************************************************/ 2952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/* Resampler Functions */ 2962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/**************************************************************************/ 2972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 2992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/*! 3002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \brief Reset downsampler instance and clear delay lines 3012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \return success of operation 3032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 3042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3052228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectINT FDKaacEnc_InitDownsampler(DOWNSAMPLER *DownSampler, /*!< pointer to downsampler instance */ 3062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int Wc, /*!< normalized cutoff freq * 1000* */ 3072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int ratio) /*!< downsampler ratio (only 2 supported at the momment) */ 3082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 3102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project UINT i; 3112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const struct FILTER_PARAM *currentSet=NULL; 3122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDK_ASSERT(ratio == 2); 3142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDKmemclear(DownSampler->downFilter.states, sizeof(DownSampler->downFilter.states)); 3152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project DownSampler->downFilter.ptr = 0; 3162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* 3182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project find applicable parameter set 3192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project */ 3202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project currentSet = filter_paramSet[0]; 3212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for(i=1;i<sizeof(filter_paramSet)/sizeof(struct FILTER_PARAM *);i++){ 3222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project if (filter_paramSet[i]->Wc <= Wc) { 3232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project break; 3242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project currentSet = filter_paramSet[i]; 3262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 3272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project DownSampler->downFilter.coeffa = currentSet->coeffa; 3292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project DownSampler->downFilter.gain = currentSet->g; 3322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FDK_ASSERT(currentSet->noCoeffs <= MAXNR_SECTIONS*2); 3332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project DownSampler->downFilter.noCoeffs = currentSet->noCoeffs; 3352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project DownSampler->delay = currentSet->delay; 3362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project DownSampler->downFilter.Wc = currentSet->Wc; 3372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project DownSampler->ratio = ratio; 3392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project DownSampler->pending = ratio-1; 3402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project return(1); 3412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 3422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/*! 3452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \brief faster simple folding operation 3462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Filter: 3472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project H(z) = A(z)/B(z) 3482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project with 3492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project A(z) = a[0]*z^0 + a[1]*z^1 + a[2]*z^2 ... a[n]*z^n 3502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \return filtered value 3522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 3532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Projectstatic inline INT_PCM AdvanceFilter(LP_FILTER *downFilter, /*!< pointer to iir filter instance */ 3552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT_PCM *pInput, /*!< input of filter */ 3562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int downRatio, 3572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int inStride) 3582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 3592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT_PCM output; 3602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int i, n; 3612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#ifdef RS_BIQUAD_SCATTERGAIN 3642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define BIQUAD_SCALE 3 3652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 3662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#define BIQUAD_SCALE 12 3672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 3682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL y = FL2FXCONST_DBL(0.0f); 3702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL input; 3712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (n=0; n<downRatio; n++) 3732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project { 3742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_BQS (*states)[2] = downFilter->states; 3752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project const FIXP_SGL *coeff = downFilter->coeffa; 3762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project int s1,s2; 3772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project s1 = downFilter->ptr; 3792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project s2 = s1 ^ 1; 3802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#if (SAMPLE_BITS == 16) 3822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project input = ((FIXP_DBL)pInput[n*inStride]) << (DFRACT_BITS-SAMPLE_BITS-BIQUAD_SCALE); 3832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#elif (SAMPLE_BITS == 32) 3842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project input = pInput[n*inStride] >> BIQUAD_SCALE; 3852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 3862228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#error NOT IMPLEMENTED 3872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 3882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#ifndef RS_BIQUAD_SCATTERGAIN /* Merged Direct form I */ 3902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_BQS state1, state2, state1b, state2b; 3922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state1 = states[0][s1]; 3942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state2 = states[0][s2]; 3952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 3962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Loop over sections */ 3972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i=0; i<downFilter->noCoeffs; i++) 3982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project { 3992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL state0; 4002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Load merged states (from next section) */ 4022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state1b = states[i+1][s1]; 4032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state2b = states[i+1][s2]; 4042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state0 = input + fMult(state1, coeff[B1]) + fMult(state2, coeff[B2]); 4062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y = state0 - fMult(state1b, coeff[A1]) - fMult(state2b, coeff[A2]); 4072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4082228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Store new feed forward merge state */ 4092228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project states[i+1][s2] = y<<1; 4102228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Store new feed backward state */ 4112228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project states[i][s2] = input<<1; 4122228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4132228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Feedback output to next section. */ 4142228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project input = y; 4152228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4162228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Transfer merged states */ 4172228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state1 = state1b; 4182228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state2 = state2b; 4192228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4202228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Step to next coef set */ 4212228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project coeff += BIQUAD_COEFSTEP; 4222228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 4232228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project downFilter->ptr ^= 1; 4242228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 4252228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Apply global gain */ 4262228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y = fMult(y, downFilter->gain); 4272228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4282228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else /* Direct form II */ 4292228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4302228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Loop over sections */ 4312228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for (i=0; i<downFilter->noCoeffs; i++) 4322228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project { 4332228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_BQS state1, state2; 4342228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project FIXP_DBL state0; 4352228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4362228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Load states */ 4372228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state1 = states[i][s1]; 4382228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state2 = states[i][s2]; 4392228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4402228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project state0 = input - fMult(state1, coeff[A1]) - fMult(state2, coeff[A2]); 4412228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y = state0 + fMult(state1, coeff[B1]) + fMult(state2, coeff[B2]); 4422228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Apply scattered gain */ 4432228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project y = fMult(y, downFilter->gain); 4442228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4452228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Store new state in normalized form */ 4462228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#ifdef RS_BIQUAD_STATES16 4472228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Do not saturate any state value ! The result would be unacceptable. Rounding makes SNR around 10dB better. */ 4482228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project states[i][s2] = (FIXP_BQS)(LONG)((state0 + (FIXP_DBL)(1<<(DFRACT_BITS-FRACT_BITS-2))) >> (DFRACT_BITS-FRACT_BITS-1)); 4492228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 4502228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project states[i][s2] = state0<<1; 4512228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 4522228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4532228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Feedback output to next section. */ 4542228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project input=y; 4552228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4562228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Step to next coef set */ 4572228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project coeff += BIQUAD_COEFSTEP; 4582228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 4592228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project downFilter->ptr ^= 1; 4602228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 4612228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4622228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 4632228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4642228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project /* Apply final gain/scaling to output */ 4652228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#if (SAMPLE_BITS == 16) 4662228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project output = (INT_PCM) SATURATE_RIGHT_SHIFT(y+(FIXP_DBL)(1<<(DFRACT_BITS-SAMPLE_BITS-BIQUAD_SCALE-1)), DFRACT_BITS-SAMPLE_BITS-BIQUAD_SCALE, SAMPLE_BITS); 4672228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project //output = (INT_PCM) SATURATE_RIGHT_SHIFT(y, DFRACT_BITS-SAMPLE_BITS-BIQUAD_SCALE, SAMPLE_BITS); 4682228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#else 4692228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project output = SATURATE_LEFT_SHIFT(y, BIQUAD_SCALE, SAMPLE_BITS); 4702228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project#endif 4712228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4722228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4732228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project return output; 4742228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 4752228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4762228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4772228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4782228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4792228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project/*! 4802228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \brief FDKaacEnc_Downsample numInSamples of type INT_PCM 4812228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project Returns number of output samples in numOutSamples 4822228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4832228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project \return success of operation 4842228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project*/ 4852228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4862228e360595641dd906bf1773307f43d304f5b2The Android Open Source ProjectINT FDKaacEnc_Downsample(DOWNSAMPLER *DownSampler, /*!< pointer to downsampler instance */ 4872228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT_PCM *inSamples, /*!< pointer to input samples */ 4882228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT numInSamples, /*!< number of input samples */ 4892228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT inStride, /*!< increment of input samples */ 4902228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT_PCM *outSamples, /*!< pointer to output samples */ 4912228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT *numOutSamples, /*!< pointer tp number of output samples */ 4922228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT outStride /*!< increment of output samples */ 4932228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project ) 4942228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project{ 4952228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project INT i; 4962228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *numOutSamples=0; 4972228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 4982228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project for(i=0; i<numInSamples; i+=DownSampler->ratio) 4992228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project { 5002228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *outSamples = AdvanceFilter(&(DownSampler->downFilter), &inSamples[i*inStride], DownSampler->ratio, inStride); 5012228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project outSamples += outStride; 5022228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project } 5032228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project *numOutSamples = numInSamples/DownSampler->ratio; 5042228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 5052228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project return 0; 5062228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project} 5072228e360595641dd906bf1773307f43d304f5b2The Android Open Source Project 508